Electromagnetic flowmeter construction

Abstract

A magnetic induction flowmeter to measure the rate of flow of a fluid features a plastic flow element (10) with a tubular section (12) adjoining a flow channel (18). Electrodes (22) penetrate the tubular section (12) and are positioned at a distance from each other in the flow channel (18). The electrodes (22) are made of an electroconductive material composed of a base material and an electroconductive supplemental substance finely distributed within said base material. The base material is identical to or is related to the plastic of the flow element (10) and the electrodes (22) are joined with the tubular section (12) of the flow element (10) to form a homogeneous material compound.

What is claimed is: 
     
       1. An electromagnetic flowmeter for measuring the flow rates of fluids, comprising; a tubular section having a wall of a radial thickness and formed of synthetic plastic material,   a pair of bores formed through said wall and arranged in diametrically opposed positions on said wall,   said bores forming radially extending surfaces in the wall of said tubular section,   an electrode disposed within each of said bores in the wall of the said tubular section and each of said electrodes having a radially extending exterior surface having a radial dimension which corresponds with the radial thickness of said tubular section,   said electrodes formed of the same base material as said tubular section and an electroconductive additional substance finely distributed within said base material,   said exterior surface of each of said electodes respectively engaging one of said surfaces of said tubular section defining said bores throughout the radial thickness of said wall,   a melt zone formed between said exterior surface of each of said electrodes and said surface of said tubular section walls forming said corresponding bores by local melting of the corresponding surfaces, and   said melt zone comprising the entire radially extending exterior sufaces of said electrodes and of the surfaces of said tubular section forming said bores whereby said melt zone extends for the entire radial thickness of said tubular section.